Julianne Hough Gets Big Shout-Out from Brother Derek Hough Over “Grease: Live!” Performance

Julianne Hough wowed fans as Sandy in Fox’s live musical production Grease: Live! on Sunday evening–but probably none more than brother Derek Hough, who gave his Dancing With the Stars costar a big shout-out. “Killin it ! #GREASELIVE my Sister…